Add tabulator table webcomponent

packages/tabulator-table/test/unit.js

+import {assert} from '@esm-bundle/chai';
+
+import '../src/dbp-theme-switcher';
+import '../src/demo';
+
+suite('dbp-theme-switcher basics', () => {
+    let node;
+
+    setup(async () => {
+        node = document.createElement('dbp-theme-switcher');
+        document.body.appendChild(node);
+        await node.updateComplete;
+    });
+
+    teardown(() => {
+        node.remove();
+    });
+
+    test('should render', () => {
+        assert.isNotNull(node.shadowRoot);
+    });
+});
+
+suite('dbp-theme-switcher demo', () => {
+    let node;
+
+    setup(async () => {
+        node = document.createElement('dbp-theme-switcher-demo');
+        document.body.appendChild(node);
+        await node.updateComplete;
+    });
+
+    teardown(() => {
+        node.remove();
+    });
+
+    test('should render', () => {
+        assert.isNotNull(node.shadowRoot);
+    });
+});